ITunes 11 42404 error

Help!!! I am getting an error in iTunes after I upgraded to version 11. I am running Windows 7, IE 9 (now 10).  The two error messages are:
Error1:  A required iTunes component is not installed. Please repair or reinstall iTunes. (-42404)
Error2:  We could not complete your iTunes Store request. A required iTunes component is not installed. Please repair or reinstall iTunes. (-42404)
So far I have tried to fix this by:
Signing out of iTunes Store and then sign back in.  Instead of fixing the issue I am now locked out of iTunes Store and cannot sign back in. When I shut my computer down and restarted I now get a third error message.
Error3:  We could not complete your iTunes Store request. An unknown error occurred (-50).
After seeing the advice on other postings I uninstalled iTunes. I uninstalled QuickTime.  I deleted the SC files. I deleted my iTunes Library file and replaced it with a previous version. Reinstalled iTunes… same error message. 
I then uninstalled iTunes again. Downloaded the previous version of iTunes. Changed the library file again because the previous version will not open a file that has been opened in a new version. Started iTunes and got the same error message.
I have now done combinations of the items above 10 times and still have not been able to fix the issue. What is worse is that I have 9 different devices that I sync with iTunes. Now when I attach a device to the computer and iTunes is not running, it does not launch automatically. When I launch it manually, I get the error message #1 noted above and then I get the following message:
iTunes cannot read the contents of iPad “name”. Go to the Summary tab in iPad preferences and click Restore to restore this iPad to factory settings. 
… same thing with iPhones, iPods, etc.. I have 9 devices how they all need to be restored to factory settings.  No, I have not done this on any of them yet, because I believe this issue is somehow related to the error messages I am getting.
I have checked everything I know how to do on the computer. Run every diagnostic I can and have found nothing. Please, someone help!

No it was never resolved. Apple support pointed at Windows as the issue. Windows support pointed at Apple.  Go figure...!  I tried every recommendation posted on every board I could find.
Due to some other needs, i finally bought a new computer and started from scratch. I am not happy with Apple support and Windows support.  Some days I wish there was a 3rd option.
Sorry I could not be of more assistance.  Good luck with resolving your issue.

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